How to Change Device Group Properties

The method for establishing the primary ownership of a device
group is based on the setting of an ownership preference attribute called preferenced. If the attribute is not set, the primary owner of an
otherwise unowned device group is the first node that attempts to access a
disk in that group. However, if this attribute is set, you must specify the
preferred order in which nodes attempt to establish ownership.

If you disable the preferenced attribute, then the
failback attribute is also automatically disabled. However,
if you attempt to enable or re-enable the preferenced attribute,
you have the choice of enabling or disabling the failback attribute.

If the preferenced attribute is either enabled or
re-enabled, you are required to reestablish the order of nodes in the primary
ownership preference list.

This procedure uses clsetup to set or unset the preferenced attribute and the failback attribute
for Solaris Volume Manager or VxVM device groups.

Before You Begin

To perform this procedure, you need the name of the device group for
which you are changing attribute values.

The phys-schost# prompt
reflects a global-cluster prompt. Perform this procedure on a
global cluster.

This procedure provides the long forms of the Sun Cluster commands.
Most commands also have short forms. Except for the long and short forms of
the command names, the commands are identical. For a list of the commands
and their short forms, see Appendix B, Sun Cluster Object-Oriented Commands.

Become superuser or assume a
role that provides solaris.cluster.read and solaris.cluster.modify RBAC authorization on any node of the cluster.

Start the clsetup utility.

# clsetup

The Main Menu is displayed.

To work with device groups,
type the number that corresponds to the option for device groups and volumes.

The Device Groups Menu is displayed.

To change key properties of
a device group, type the number that corresponds to the option for changing
key properties of a VxVM or Solaris Volume Manager device group).

The Change
Key Properties Menu is displayed.

To change a device group property,
type the number that corresponds to the option for changing the preferences
and/or failback properties.

Follow the instructions to set the preferenced and failback options for a device
group.

Verify that the device group
attributes have been changed.

Look for the device group information
displayed by the following command.

# cldevicegroup show -v devicegroup

Example 5–31 Changing Device Group Properties

The following example shows the cldevicegroup command
generated by clsetup when it sets the attribute values
for a device group (dg-schost-1).